Books
Garbáty, Thomas J. Medieval English Literature. Waveland Press, Inc., 1997
Swanton, Michael. Beowulf. Manchester University Press, 1997.
Magazine: Alquin Literature: The Middle Ages. Alquin Educatieve Uitgeverij.
Chaucer, Geoffrey. Canterbury Tales. Edited by A.C. Cawley. J.M. Dent & Sonds Ltd., 1958.
Websites
Wikipedia - various articles, you know how to find them ;)